typedef unsigned char uint8;
typedef unsigned int uint16;
typedef unsigned long uint32;
typedef signed char int8;
typedef signed int int16;

#define GPS_RX_DONE 1
#define GPS_CR 13
#define GPS_LF 10 

#define GPIO_OUTPUT 1

#define GPIO_INPUT 0

#ifndef ULTRASOUND_STRUCT
    #define ULTRASOUND_STRUCT
    union union32bits 
    {
        uint32 u32access;
        struct
        {
            uint16 u16access_hi;
            uint16 u16access_low;   
        } word_access;
    };
#endif

